I’m guessing your talking about the Laser Web 3 software? If so there is a take a tour button that will explain what each button does - not completely, but enough to get you started. You can ask about a button you need more info on, by joining the group.
I have one on the C3D in my machine, and so far the only use I have used it for is to home, disable motors and then re-position the carriage to where I want the file to start after I hit play to the file transferd over via LAN.